Diamond-holder.



P. F. THOMSON.

DIAMOND HOLDER.

APPLICATION FILED'APR.25. 1914.

1,191,746. PatentedJu1y18,1916.

A TTORNEY of Indiana, have invented STATES PATENT OFFICE.

PAUL 5F. THOMSON, OF INDIANAPOLIS, INDIANA.

DIAMOND-HOLDER.

Application led April 25, 1914.

vexact description thereof, reference being had to the accompanying'drawings in which like letters refer to .like parts.

The object of this invention 1s to improve the construction of diamond holders vsothat the diamond holdel' absorbs the shock and thus saves the-diamond from severe knocks thatfcrack and destroy 1t, especiallyl when thrust into an emery or other grinding Wheel y accidentally by a careless operator, and it enables the diamond to be readily changed to a new cutting point as often as desired, and the holder will holddiamonds of various sizes and shapes and at the same time it is -simple andA economical in construction to use owing to the fact that resetting the diamond by the brazing and casting processes are eliminated.

The nature of the invention will be understood fromthe accompanying drawings and the 'following description and claims.

In the drawings, Figure 1 is a plan view of the diamond holder. F ig. Q is a central longitudinal section of the major portion thereof. Fig. 3 is a sectionon the line 3-3 of Fig..2.

In detail there is a cap or casing 10 which is tubular with one end taperingr outward and provided with a reduced opening at 11 which communicates with a large opening 1'2 and the latter opening communicates with a still larger opening, the surface 13 oi whichis threaded and between the internal portions 12 and 13 of said casing there is aninclined shoulder14. Likewise the opening 11'has an inclined surface 15 so that said opening tapers outwardly to receive the diamond 16 which is larger than the contracted portion of the opening 11 and, therefore, it cannot escape through said opening, but a portion of the diamond projects outward beyond said opening to do its work. j

The diamond is. held to its position by a copper holder 17, the main portion of which is tubular, but one endisfclosed and the outer surface of said closedend has a conical recess l8'which surrounds and supports the inner .end o'f/the diamond. The member 17 Specification of Letters Patent.

Patented July 18, 1916.

Serial No. 834,412.

slidably fits in the chamber 12 of the casing 1() and 1s supported by said casing and the `major portion of said member 17 is surrounded and supported by the sleeve 20, the outer end ot' which is tapered to engage and seat on vthe inclined shoulderll of they cap 10 and which is externally threaded and lies in the enlarged chamber of the casing 10 and said sleeve has a shank 21 for securing it in a suitable handle or tool holder. The sleeve 20 ha's a central opening QQ'for receiving the open end of the copper holder 17 which has a chamber 23 and a helical spring 24 fits A-in the chamber 23 of the holder 17 and the chamber 22 of the sleeve 20, and the end of said chamber 22 is conical so that the end of the `spring will fit centrally therein. The spring forces the holder 17, and, therefore, the diamond outward and holds the diamond in place 'to do its work. The tension of the spring 24is governed bythe size ofthe diamond 16, as for instance, a large diamond will compress the spring more than a small.- diamond and as the larger diamond is used to do heavier and harder work, it will be seen that it requires a greater vspring pres' sure to keep it in its proper position.

The invention claimed is:

1. diamond holder including a hollow casing with a reduced end opening for holding the diamond so that it will project outward therefrom, a sleeve adapted to screw into engagement with theother end of said casing-a movable holding member slidably mounted in said casing and sleeve and firmly heldthereby with the outer end recessed for receiving the inner end of the diamond and the 'inner end tubular, and a helical spring lying in the tubular portions of said holder and sleeve for forcing the holder and diamond outward.

2. A diamond holder including a casing having a. contracted end with an outwardly tapering opening for the diamond and a larger opening in said casing adjacent said, diamondopening and a still larger opening at the other end of said casing Where the casing is internally threaded, a sleeve externally threaded so as to screw into said casing and with an opening therein of the same diameter as the intermediate opening in the casing, a diamond holding member slidably mounted in said casing and sleeve and firmly held thereby and one end adapted to engage the inner portion of the diamond and with ward therefrom, a sleeve adapted toserew into engagement with the other end of said casing, and a movable holding member slidably mounted in said casing,the holdingvend being supported. by said casing and the major portion supported by said sleeve.

In Witness whereof, I have hereunto affixed my signature in the presence of the witnesses herein named.

PAUL F. THoMsoN.

Witnesses: Y

J. H. WELLS,

O. M. MGLAUGHLIN. 

